Two New 11‐Hydroxy‐Substituted Gelsedine‐Type Indole Alkaloids from the Stems of Gelsemium elegans

Helvetica Chimica Acta
2009.0

Abstract

<jats:title>Abstract</jats:title><jats:p>Two new 11‐hydroxy‐substituted gelsedine‐type indole alkaloids, named 11,14‐dihydroxygelsenicine (<jats:bold>1</jats:bold>) and 11‐hydroxygelsenicine (<jats:bold>2</jats:bold>), together with six known alkaloids, <jats:italic>i.e.</jats:italic>, koumine, gelsemine, 14‐hydroxygelsenicine, 11‐hydroxyhumantenine, gelsenicine, and (19<jats:italic>Z</jats:italic>)‐akuammidine, were isolated from the EtOH extract of the stems of <jats:italic>Gelsemium elegans</jats:italic> <jats:sc>Benth.</jats:sc> Their structures were determined mainly by means of spectroscopic analyses including HR‐ESI‐MS and 2D‐NMR (HSQC, HMBC, <jats:sup>1</jats:sup>H,<jats:sup>1</jats:sup>H‐COSY). The configuration of <jats:bold>1</jats:bold> was confirmed by X‐ray‐diffraction analysis.

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